I. Heavy Bronze coins cast in a mould, Æs Grave. II. The so-called Consular or Family series, consisting of silver and bronze struck coins, together with a few gold pieces.
Coins of the Empire.
III. Gold and silver, struck by the authority of the Emperor.
IV. Bronze (commonly called Large, Middle, and Small Brass), struck by authority of the Senate, and distinguishable by the letters S. C. (Senatus-Consulto).
V. Imperial medallions in all metals, not intended to circulate as money.
§ OF THE ÆS GRAVE.
(1) The æs grave was the earliest money used in Rome and throughout the central and northern parts of the Italian peninsula. It consisted of the As (or unit) and its divisions and multiples, as follows:—
| As. | Obv. Head of Janus; | Rev. Prow of ship. | Mark of value | I |
| Semis (1/2 As). | Obv. Hd. of Jupiter | " | " | S |
| Triens (1/3 As). | " " Pallas | " | " | .... |
| Quadrans (1/4 As). | Obv. Head of Hercules | " | " | ... |
| Sextans (1/6 As). | " " Mercury | " | " | .. |
| Uncia (1/12 As). | " " Roma | " | " | . |
MULTIPLES OF THE AS.
| Dupondius (2 Asses). | O. Hd. of Pallas; | R. Prow of ship. | Mark of value | II |
| Tripondius (3 Asses). | " | " | " | III |
| Decussis (10 Asses). | O. Head of Roma. | " | " | X |